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5. Mandy came home late. As she reached to turn on the kitchen light, her hand brushed
against something unexpected. Her adrenal glands, as a part of the "fight-or-flight"
response, released epinephrine and norepinephrine, which increased her heart rate and
blood pressure. Even after she realized it was just the curtain, her excited feelings
lingered. This example illustrates
A) how chemicals can amplify or block a neurotransmitter's activity.
B) that a resting axon has gates that block positive sodium ions.
c) how the myelin sheath insulates and increases the speed of neural messages.
D) the all-or-none response in neural firing.
E) that endocrine messages tend to outlast the effects of neural messages.